Clutch and brake for motor drives



March 18, 1952 w. H. LEWIN CLUTCH AND BRAKE FOR MOTOR DRIVES 2SHEETS-SHEET l f/o ln/ 1 1---- j.

INVENTOR.

W/L/AM M/ fw//v FIGB A T TRN" .Y

March 18, 1952 w. H. LEWIN CLUTCH AND BRAKE FOR MOTOR DRIVES 2 SHEETS-SHEET 2 Filed June 25, 1946 FIG Patented Mar. 18, 1952 William H. Lewin,New York, N. Y. Application June 25, 1946, Serial No. 679,209'

This invention relates to motor drive. `Machines such as sewing machinesare usually driven f.1m a common motor drive which supi plies power to aplurality of such machines. Where individual motor drive is used,thatfis, where one machine is driven by one motor, it is necessary to`provide a clutch between the motor and thefmachine, so that the motorcould be started and the machine clutched thereto when the motor isrunning at full speed. Such individual N'drive motors as heretoforeconstructed have been quite cumbersome A and as heretofore designednecessitated relatively large space. -It is therefore an object of thisinvention to provide a highly improvedand compact individual motor drivefor sewing machines or the like. comprising aY clutch and brake whichcan be built into'a standard size electric motor without increasin theoverall dimensions of the motor, Yet another object of this invention isto provide an individual motor drive of the character describedcomprising an armature shaft of the motor, a ilyawheel thereon providedwitha friction liner, a brake friction liner attached tothe motorcasing, a sleeve slidable in the motor bearing housingl disposed aboutthe armature shaft, a pulley wheel mounted on said sleeve lby means of aballbearing, and means to shift said' sleeve in one direction to engagethe pulley with the ily wheel and in an opposite direction to engage thepulley with the brake. i f

A still further object of this invention is to provide, in an individualmotor drive of the character described, a combination radial and thrustbearing f or the armature shaft'to permit a clearance between said shaftand the shiftable-sleeve thereon so as to eliminate friction betweensaidsleeveand shaft. f Yet a further object of this invention is toprovide acompact and rugged individual motor drive of the character described,which shall occupy. a

minimum of space, which shallbe relatively inexpensive to .manufacturesimple to control;.

smooth'andpositive in operation, and which shall yet be praotic'zalv andeiiicient to a high 'degree in use. Y 'l Other'objects of this-inventionwill in.' part be obvious and in part hereinafter pointedfout.

The invention accordingly consists in the features of construction,combinations of elements,

vand arrangement of parts which will be vexempli- Y fied in theconstruction hereinafter described, and of which the scope ofapplication will'be 1n` dicated in the following claims. j gIn theaccompanying drawing.'

in' y which.. is

- support I2.

13 claims. (C1. 19a-18) shown various possible illustrative embodimentsof thisinvention,

Fig. 1 is an end view of an individual motor drive embodying theinvention;l

v Fig. 2 is a partialfside elevational view thereof; Fig. 3 is across-sectional view taken on line 3 3 of Fig. 1; A

Fig. 4 is a cross-sectional view taken on line 4-4 ofFig.3; .L j

Fig. 5 is a side elevational view of an individual motor drive embodyingthe invention, and illustrating 'a modified construction;

Fig. 6 is a cross-sectional view taken on line 6-46 of Fig. 5; and gFig; 7 is a' cross-sectional view taken on line 1 1 of Fig. 6. i -V .l y

Referring now in detail to the drawing, Ill designates an individualmotor drive embodying the invention. The same comprises a motor I Iwhich may be hung or supported from any suitable The motor I0 isprovided with legs I3 which may be bolted as at I4 to the support I2,vThe motor. II comprisesan outer casing I5 of usual construction and anarmature shaft I6. Attached to one end` of the casing I5 is a fixedbonnet or end member` I1. The bonnet IT-has a cylindrical portion 20running into an annular ilat portion 2|. Extending from said portion 2Iis an annular thickened boss or hub 22. Wall 20 is formed with a throughopening 23 having ari enlarged portion 24 disposed within the boss 22.Opening 23 may be counter-sunk as at 25, at the inside of the motor. Thelboss 22 is formed lat opposite sides thereof with a pair `of parthelical slots 3II and 3 I. Said slotscross one another and are solocated that any line perpendicular tov and intersecting the axis of'saidhub 22 and passing through slot 30 will alsol pass through slot 3I.g'Extending from the armature shaft IB of the motor is areducedportion'34 integral therewith. forming a shoulder 35. On shaftportion 34 is a thrust bearing 36 contacting the shoulder 35 and alsoreceived Within the countersunk opening 25, thereby providing a bearingto take up thrust imposed on the motor shaft I6 in the direction of thefly wheel as will appear hereinafter. For the purpose hereinafterappearing, there is attached to theouter surface40 -of the hub 22, ametal plate 4I. The plate 4I may be attached to the hub by means `ofscrews 42. Attached to the metal plate 4I is a flat, ring-like frictionbrake-lining- 44. Brake lining 44 may be vattached to the plate by meansof screws 45. Keyed to the outer end of extension shaft 34.

as by. means of key 50, is a y wheel 5 I. Attached sleeve 50 has areduced portion 6I received within the opening 23 and an enlargedportion 92 re` ceived within the opening 24.

It is furthermore formed with a portion E5 of reduced diameterprojecting through the central openings in the metal plate 4| and brakeliner 44 and projecting therebeyond. 'I he sleeve 691s. formed with anaxial through opening through which the shaft passes. with a pair ofdiametrically opposed radial threaded openings I2 the lslots 39, 3|. ingr2 is the threaded shank A14l of screwv 1s. 'rile screw 15 is providedwith a portion 15 extending into the opening 39, and witha slotted head11. On portion 16 of the screw 15 is a sleeve 18. Screwed into theopening 13 is the threaded shank 800i a rod 8|'. Said rod SI 'has aportion 82 disposed within slot 3|. On portion 82 is a sleeve 83.Extending from portion 82- isa rod portion 84 'which may' be. connectedby a coil tension spring 85 to a hook 85 fixed to one of the motor legs.Spring 85 normally tends to rotate rod 8| in a counterclockwisedirection. l'

Attached to the outer end of rod 84 is a link 81 which may` be connectedto a foot pedal.

Mounted on portion' G'of sleeve |50 is a ball bearing 90 supporting apulley 9|. 9| carries a belt 92 which may beconnected to a sew-ingmachine or any other machine or object tube driven. It will be. notedthat the pulley 9| is disposed between the friction members 44 and 13which register withA Screwed into the threaded openy The. pulleyV Saidsleeve is formed or portion 99 of reduced diameter passing through thehub. The hub 91 extends outwardly to the end wall 96. Extending inwardlyofthe end wall 90 is an annular wall |00, countersunk as at |0I. The hub91 is formed with an axial through opening |02 having a reduced portion|03 extending to the countersunk opening I0 I. Attached to the outer endof the shaft 99 is a flywheel 5I, similar to thev ily wheel'of Fig. 3.Attached to the hub 91 is a friction brake 54, similar to the frictionbrake shown in Fig, 3.

Slidably mounted within the hub 91 is a sleeve 60 similar to the sleeve60 of Fig. 3. On said sleeve is the pulley 9|. Sleeve 60 is formed withdiametrically'opposed screw threaded openings 12. and 13. The hub 91 isformed at opposite sides thereof with aligned longitudinal slots |05.Screwed'into the threaded openings 12 and 13 are oppositely extendingpins |96 which project through the slots |05. Y

The hub 91 is provided, at its lower end, with a downwardly extendingboss |08 formed with a horizontal through opening |09 disposed at rightangles to the axis of shaft 98. Extending through the opening |09 is. avpivot pin H0. Attached to opposite ends of the. pinv |.I0 are upwardlyextending forked arms each provided 'atvits upper end with a fork I I2engaging an end of pin |06. One of the arms I|I is in. theA form oir-alever having a portion ||3 extending below the pin III); and extendingfrom said portion I3 is an arm H4. which may be attached to afoot pedallor other control. Attached to arm Illt isan upwardly extending pin I;I5 which projects and 53. The pulley 9| may rotate freely on the thedrive willV now 'be exshift of' the lsleeve is due to the fact that theysleeves or rollers 18 and 33 are in the slots 3i) and sl'. wne-the rods4 is pulled upwardly,

theroller 93v will tend to move to the left end of v"slot 3| therebycausing the rollerv 18. to also move to thefleft end of the slot 30. Thesleeve is` hence. `shifted to the left.' Such operation of the sleevewill'shift the pulley 9| intofcontact with the friction brake tritonormally retain the pulley in braked condition. The motor may thusrotate together with itsr ily wheel 51| without rotating, the pulley 9|or the machine to which it is belted. When it isl desired to rotate thepulley 9 I'.' the link or rod 81 is pulled downwardly thereby serving torotate sleeve ina clockwise direction, looking at Fig. l, and causingsaid sleeve to be shifted to the right, looking atA Fig.

contact with therotating fly wheel 5I.

In Figs. 5, 6 and 7- there is shown an individual 3. .Such'operationwill move'the pulley 9| into e motor drive. I' embodying thev inventionand illustrating amodified construction. The same comprises a motor 95formed with an end wall 95 at one end.` Extending fromtheend wall 98 isa hub 91. The motor is furthermore provided with an armature shaft 98.Extending from the y'1i armature shaft 98 is a co-axial shaft extensionabove the level of the. pivot` pin H0, The upper end of pin H5 isanchored by a spring ||.|ito an anchor |-I1 on the motor. The spring.Ilf is located above the pivotal axis of pin I I0 theref by tending, torotate lever arm IM in a counterclockwise direction for shifting sleeve66 tothe left to thereby retain the pulley 9| in braked condition. Whenit is desired to operate the machiner which is belted to the pulley 9|by belt 92., lever arm ||4 is pulled downwardly, thereby tensioningspring I I6 and shifting sleeve 66 tov the'right for 'moving pulley 9|.into engage;

ment with the friction liner 52 .of the fly wheel 5 I.

Within the countersunk opening ||l| is a combnation radial andthrustbearing |20 supporting a shaft 99. With such construction thesleeve 65 may havey a clearance with shaft 99. The inner radial race ofthe bearing I2I1v contacts a shoulder between shaft-portions 98 and99vas shown in Fig. 7 of the drawing.

It will thus be seen that there. isv providedv a. device in which the.vseveral objects ofthis invention are achieved, and which is well adaptedto meet the conditions; of practical use.

As various possible embodiments might be made of the above invention,and as various changes might be made in the embodiments. above setforthx it is to be vunderstood that. all matter herein set. forth orshown in the accompanying drawing's vto be interpretedas illustrativeand not in a limiting sense.

. Having thus described Ymy invention, I claim as new and desire tosecure by Letters Patent:

1. An individual motor drive comprising an electric motor having a hubat one end, a brake on the. outer end of said hub, said motor having anarmature shaft passing through the hubl a fly' wheelv on said shaft andbeyond. the hubfa manually controlled shiftable. sleeve within the h'ubjand on said shaft. a; pulley rotatably and non-slidably mounted on saidsleeve and shiftable therewith'. said pulley being located between saidbrake and said fly wheel, and means to shift said sleeve in onedirectionv into contact,l with the brake to brake the pulley, and in anopposite direction to engage the pulley with the fly wheel for rotationtherewith.

` 2. In combination, a 'motor provided with a hub-at one end, said motorhaving an armature shaft passing through said hub exteriorly of themotor said hub having an exposed face transverse of said shaft,l aflywheel-at the end of said shaft, a sleeve' slidablewithi'n said hub, abrake member on the face of said hub, a member' rotatably mounted onsaid sleeve by means of a ball bearing, vsaid member being disposedbetween the y wheel and said brake, and means to shift said sleeve forselectively engagingthe opposed `faces of saidmember either with the flywheel or with the brake. 4

3. In combination, a motor provided with a hub at one end, said motorhaving an armature shaft passing through said hub exteriorly of themotor, a fly wheel at the end of said shaft, a sleeve slidable withinsaid hub, a brake member at one end of said hub, a member rotatablymounted on said sleeve by means of a ball bearing, said member beingdisposed between the fly wheel and said brake, means to shift saidsleeve for selectively engaging said member either with the flywheel orwith the brake, said means including opposite slots formed in said hubmember, and means attached to said sleeve and passing through saidslots.

4. In combination, a motor comprising a motor casing provided with a hubat one end, said motor having an armature shaft passing through said hubexteriorly of the motor, a fly wheel at the end of said shaft, a sleeveslidable within said hub, a brake member at one end of said hub, amember rotatably mounted on said sleeve by means of a ball bearing, saidmember being disposed between the ily wheel and said brake, means toshift said sleeve for selectively engaging said member either with thefly wheel or with the brake, and thrust bearing means to take up thrustwhen said member is engaged with said fly wheel.

5. In combination, a motor comprising a motor casing provided with a hubat one end, said motor having an armature shaft passing through said hubexteriorly of the motor, a fly wheel at the end of said shaft, a sleeveslidable within said hub, a brake member at one end of said hub, amember rotatably mounted on said sleeve by means of a ball bearing, saidmember being disposed between the fly wheel and said brake, means toshift said sleeve for selectively engaging said member either with theily wheel or with the brake, and combination thrust and radial meansinterposed between said shaft and motor. and said sleeve having aclearance relative to said shaft.

6. In combination, a motor comprising a motor casing provided with a hubat one end, said motor having an armature shaft passing through said hubexteriorly of the motor, a ny wheel at the end of vsaid shaft, a sleeveslidable within said hub, a brake member at one end of said hub, amember rotatably mounted on said sleeve by means of a ball bearing, saidmember being disposed between the ily wheel and said brake, means toshift said sleeve for selectively engaglng said member either with theily wheel or with the brake, said means including opposite slots formedin said hub member, and means1 attached to said sleeve and passingthrough said' slots, said slots being inclined and soarranged that aline perpendicular to and intersecting the axis of said fly wheel shaftand passing through one of said slots, also passes through the other ofsaid slots.

'7. Incombination, a motor comprising a motor casing provided with a hubat one'end, said motor having an armature shaft passingthrough said hubexteriorly of the motor, a ily wheel at the end of said shaft, a sleeveslidable Within said hub, a brake member at one end of said hub-,- amember rotatably mounted on said sleeve by means of a ball bearing, saidmemberibeing dis.- posed between the ily wheel and said brake, means toshift said sleeve for selectively engageV ing said member either withthe fly wheelor with the brake, and means for normally biasing saidrotary member into engagement with said brake.

8. In combination, a motor comprising a fnotor casing provided with ahub at one end, said motorl having an armature shaft passing throughsaid hub exteriorly of the motor, a fly wheel at the end of said-shaft,a sleeve slidable within said hub, a brake member at one end of saidhub, a member rotatably mounted on said sleeve by means of a ballbearing, said member being disposed between the'ily wheel and saidbrake, means to shift said sleeve for selectively engaging said membereither with the fly wheel or with the brake, thrust bearing means totake up thrust when said member is engaged with said fly wheel, andmeans for normally biasing said rotary member into engagement with saidbrake.

9. In combination, a motor comprising a motor casing provided with a hubat one end, said motor having an armature shaft passing through said hubexteriorly of the motor, a fly wheel at the end of said shaft, a sleeveslidable within said hub, a brake member at one end of said hub, amember rotatably mounted on said sleeve by means of a ball bearing, saidmember being disposed between the fly wheel and said brake, means toshift said sleeve for selectively engaging said member either with thefly wheel or with the brake, said means including opposite slots formedin said hub members, pins attached to said sleeve and passingthroughsaid slots, said slots being aligned with one another andoppositely disposed and extending longitudinally of said sleeve, and afork member pivoted to said motor casing about an axis perpendicular tothe axis of said shaft and engaging said pins, and meansfor rotatingsaid forked member.

10. In combination, a motor including a motor casing and a motor shafttherein and extending beyond said casing, a fly wheel fixed to the shaftand disposed outside of the casing, a tubular jack shaft surroundingsaid motor shaft, said motor casing having a hub surrounding said jackshaft, said jack shaft being slidably supported within said hub andhaving a clearance relative to the motor shaft, a pulley rotatably andnonslidably mounted on said jack shaft and located between the ily wheeland the hub of the motor casing.

11. In combination, a motor including a motor casing and a motor shafttherein and extending beyond said casing, a fly wheel xed to the shaft land disposed outside of the casing, a tubular jack shaft surroundingsaid motor shaft, said motor casing having a hub surrounding said jackshaft,

said jack shaft being elidably supported Within said hub and having aVclearance :relative to ,the motor rshaft, a pulley ,rotatably and,nomslidably .mounted on :said jack .Shaft and located vbetween the iiywheel and the hub of the motor casing, and argbrake at one end of saidhub and located between said pulley and hub.

l2. .In eombination,a motor including a ,motor .casing and a motorvshaft ltherein and extending beyond said casing,1a y wheel .fixed to.the shaft and disposed `.outside of the easingJ Va tubular jack shaftsurrounding said motor shaft, fsaid motor easing having a hublsurrounding said jack shaft, -said jack .shaft being slidably supportedwithin said `hub and khaving la clearance relative to the motor shaft,"a pulley rotatably and non-slidably `mounted on said jack lshaft andlocated between the ily wheel and the hub of the motor casing, and ,a'brake `at one end of said hub and located between said pulley and hub,and means for shifting said pulley in one direction toward the fly wheeland in an opposite direction toward the brake.

13. AIn combination, a motor comprising a mo- 1tor easing and motorshaft therein and extend- `ing beyond lsaid casing, a driving memberfixed on `the rshaft and disposed outside of the casing, -a tubular jackshaft surrounding the motor shaft and located wholly within the motorcasing, and

,means on Ythe motor casing to support said jack shaft for :slidingmovement, said jack shaft having 1a .clearance relative to lthe motorshaft, sa driven wheel mounted for rotation dn k@said jack -shaft butslidable therewith and located vbetween REFERENCES CITED The fol-lowingreferences are of record in the .ille vof this patent:

UNITED STATES PATENTS Number N ame s Date 1,042,090 Covell ,.n- Oct.Y2.2 :1.912 1,382,133 Spencer et al. June-21,1921 i 1,544,080 Voigt June30J v1925 1,756,576 Voigt Apr. .29., .1939 1,879,546 Seibert et al.,Sept.,27, 1119,32 ,2,037,644 Voigt Apr... l, 1936 2,250,981 Abel n.1u-157 29, 19M 2,269,788 schenk A-l- Jan. 13,1942 2,274,457 Peets etal. Feb. 247, 195:2

FOREIGN PATENTS Number Country Date 761,185 France ..v Jan. 3 '193:4

